Year | Value | 2021 | 2.719098 | 2020 | 5.384373332 | 2019 | 16.18255 | 2018 | 16.24747 | 2017 | 15.02506 | 2016 | 11.96217 | 2015 | 25.62026 | 2014 | 31.07096 | 2013 | 34.55841 | 2012 | 24.97688 | 2011 | 21.271516363636 | 2010 | 23.775 | 2009 | 14.27 | 2008 | 12.188 | 2007 | 23.941 | 2006 | 18.773 | 2005 | 15.363 | 2004 | 12.657 | 2003 | 9.72 | 2002 | 10.863 | 2001 | 10.206 | 2000 | 27.323 | 1999 | 27.8999996185 | 1998 | 28.8999996185 | 1997 | 29 | 1996 | 25.2000007629 | 1995 | 31.5 | 1994 | 23.6000003815 | 1993 | 27.1000003815 | 1992 | 27.5 | 1991 | 26.1000003815 | 1990 | 30.2000007629 | 1989 | 29 | 1988 | 23.3999996185 | 1987 | 21 | 1986 | 19.2000007629 | 1985 | 20.1000003815 | 1984 | 22.1000003815 | 1983 | 19.2999992371 | 1982 | 19.7000007629 | 1981 | 21 | 1980 | 19.7999992371 | 1979 | 17.2999992371 | 1978 | 6.1999998093 | 1977 | 6.5999999046 | 1976 | 6.6999998093 | 1975 | 7.5999999046 | 1974 | 9 | 1973 | 8.6999998093 | 1972 | 7.6999998093 | 1971 | 7.1999998093 | 1970 | 6.9000000954 |
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